78961291 has 4 divisors (see below), whose sum is σ = 79039800. Its totient is φ = 78882784.

The previous prime is 78961273. The next prime is 78961297. The reversal of 78961291 is 19216987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78961291 - 2⁷ = 78961163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78961297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37726 + ... + 39763.

It is an arithmetic number, because the mean of its divisors is an integer number (19759950).

Almost surely, 2^78961291 is an apocalyptic number.

78961291 is a deficient number, since it is larger than the sum of its proper divisors (78509).

78961291 is a wasteful number, since it uses less digits than its factorization.

78961291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78508.

The product of its digits is 54432, while the sum is 43.

The square root of 78961291 is about 8886.0165991292. The cubic root of 78961291 is about 429.0139493366.

The spelling of 78961291 in words is "seventy-eight million, nine hundred sixty-one thousand, two hundred ninety-one".